It's been a long time since I had a K1000, but I believe this is what's going on: Your camera will hold the lens wide open (f-stop 2.8, incidentally - 22 is the small opening) to permit a maximum amount of light to get to the eyepiece while framing the shot and focusing. When you push the trigger, the lens will close down to whatever aperture you've set just before the shutter opens. I believe there's a small button on the lens which you can work with your left hand. This button will momentarily close the aperture so you can see the effect through the viewfinder.

This may be controlled by the battery, so try replacing it if this trick doesn't work without one.

And as I said, it's been many a long year so my apologies in advance if this is completely wrong.

Try this test, if you haven't already: Trip the shutter while looking at the front of the lens. You should be able to see the diaphragm close down to f22 when the shutter opens. Use a slow shutter speed, and opening the camera back will help the visibility. BTW, if the shutter works without the battery, the diaphragm should also work. This is true for almost all cameras with a manual film advance. The battery is most likely only for the metering system.

You can download a manual for the K1000 at:
http://www.pentaximaging.com/customer_care/manuals_literature/show_manual

Hey thanks guys, both of you were right, and now that I check, when I release the shutter, the diaphragm closes. Oh, and you'll have to excuse my f-stop mistake...
Thanks!

No problem - enjoy your K1000! It's a good, solid camera and you should be able to get a lot of use out of it.....